Answer:
Ketone.
Explanation:
Alkynes experience additions of water catalyzed by acids, across the triple bond in the presence of mercuric ion as a catalyst. Generally, a mixture of mercuric sulfate and aqueous sulfuric acid is used.
Under acidic conditions, mercury is replaced by hydrogen to form a vinyl alcohol, called enol.
Enoles tend to be unstable and isomerize in ketones. This quick equilibrium is known as the keto-enol tautomerism.
